Laying hens have an intense motivation to use a secluded nest before laying eggs. Denying this need in battery cage systems causes significant frustration. Cage-free systems fulfill this need but create new welfare challenges.
The nesting need represents one of the clearest examples of motivational frustration in farmed animals. Hens in battery cages are denied a behavior they are strongly compelled to perform, constituting chronic welfare harm. Cage-free systems fulfill this need but introduce new challenges including feather pecking, injurious falls from multi-tier systems, and disease from litter management failures. Good management is essential.